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u 4 fsh'eefgsmgg 'W. VR. PATTERSON. 'METHOD OPM-ANUPAGTURING lELECTRIU MBLESJ.V 10.382,768.

n Patented Mayjl,

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W. vR. PA'TTBRSCN. y MET'HCD CP MANUFACTURING ELECTRIC (msm-1s.v

l UNITED STATES PATENTl OFFICE.

WILLIAM R. PATTERSON OF CHICAGO, ILLINOIS, ASSIGNOR T O THE WESTERN ELECTRIC COMPANY, OF SAME PLACE.

METHOD OF MANUFACTURING YELECTRlC' CABLES.

SPECIFICATION forming part of Letters Praten; No. 382.768, dates May 15, 1aa8. Application inea July 18,1381. serial No. 244,601. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM R. PATTERsoN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Methods of Manufacturing Electric Cables, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

Myinvention relates tothe method of and apparatus for manufacturing electric cables, whereby a core of loosely-twisted conductors is covered by a lead pipe. The coreis unseryed and the wires are so disposed as to substantially ll the pipe. As the core is only loosely twisted, the fibrous insulatingcovering of the conductors will not be compressed, and the wires being arranged so as to occupy substantially the whole space within the pipe and being substantially at uniform distances apart, the electrostatic capacity of a cable of a given size will be the lowest possible. The cable also will be quite flexible, and there will be little or no danger of breaking or injuring the pipe or conductors by bending.

I preferably force hot parafline charged with gas into the pipe among the conductors of the core in my oldand well-known way, as de scribed in my- Patent No.v 284, 226, dated Sep-y tember 4, 1883.

In the accompanying drawings, Figure 1, I have illustrated myapparatus for carrying out the process herein claimed. Fig. 2 is a sectional View of a cable made in accordance with my method. Fig. 3 is an elevation show'- ing the loosely-twisted conductors.

The conducting wires a, insulated with iibrous material, are vwound upon spools, vand as the conductors are unwound the spools are carried around upon a revolving carriage, so as to twist the strands'or conductors together. As the core b passes to the pressmc, a jacket or tubing of lead is formed over the core by the press, and the cable thus formed is taken up by a reel, d. The core is thus loosely twisted and inclosed in a lead pipe. No servingis used to bind the conductors together, and thus the conductors are distributed substantially at uniform distances apart in the pipe and so as to occupy substantially the entire space, as shown in Fig. l. y

Fig. 3 is a detailed view of ,the conductors loosely twisted together.

In Fig.'2 the pipe e surrounds the core of conductors f, the space between the conductors being filled with parafne or other insulating. filling g. p

I preferably form the tubing 0r j acketloosel y over the core, and subsequently force into the pipe and among-the conductors hot parafline in my well-known way, as shown in my said patent. l

Ihave not shown the press mechanism in detail, since there are several wellknown presses capable of doing the work.

I preferably place the revolving carriage containing the spools of conductors in a tank of melted parafine, which may be-kept hot by a steam-jacket, as shown, in order that the fibrous covering of the separate wires may be thoroughly saturated before they are formed y intothe core. -The spools may, however, be

lrevolved in a vertical plane without being saturated with any insulatingmaterial.V The subsequent filling I have found sufficient to saturate and protect the conductors.

Having thus described myinv'ention, I claim as new and desire to secure by Letters Patentl. The method of manufacturing electric cables, which ,consists in loosely twisting the insulated conductors together and then covering the core with a jacket or tubing of lcad,whereby the serving heretofore used is dispensed with and hurtful compression of the insulatingcovering of the conductors avoided, thereby lowering the electrostatic capacity of the cable, as described. y

2. The method lof manufacturing .electric cables, which consists in loosely twisting the insulated conductors together and then loosely covering the core with a jacket or tubing of lead, whereby the serving heretofore used is dispensed with and hurtful compression ofthe insulating-covering of the conductors avoided,

thereby lowering the electrostatic capacity of IOO passing the core thus formed through a press, and forming a jacket or tubing of lead over the same, whereby objectionable compression of the insulating-covering is avoided, substantially as and for the purpose specified.

4. The method of manufacturing electric cables, which consists in loosely forming the conductors into a core, loosely covering the core with a iiexible metallic jacket or tubing, and forcing meltedinsulating material into the tubing among the conductors, substantially as described.

l l l l 5. The combination, with the spools, each carrying a different wire and mounted on a revolving carriage, of the press for forming the x5 pipe over the core, as described.

In witness whereof I hereunto subscribe my name this 7th day of May, A. D. 1887.

WILLIAM R. PATTERSON.

Witnesses:

GEORGE P. BARTON, WM. M. GILLEP... 

